Add TIN number for Brunei

Fixes arthurdejong#308

stdnum/bn/__init__.py

@@ -0,0 +1,24 @@
+# __init__.py - collection of Brunei numbers
+# coding: utf-8
+#
+# Copyright (C) 2023 Leandro Regueiro
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""Collection of Brunei numbers."""
+
+# provide aliases
+from stdnum.bn import rocbn as vat  # noqa: F401

stdnum/bn/rocbn.py

@@ -0,0 +1,86 @@
+# rocbn.py - functions for handling Brunei ROCBN numbers
+# coding: utf-8
+#
+# Copyright (C) 2023 Leandro Regueiro
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""ROCBN (Brunei tax number).
+
+This number consists of 8 digits, prepended by the letter 'P' for
+Sole-Proprietorships or Partnerships, or by the letters 'RC' for Private
+Limited Companies and Public Companies, or by the letters 'RFC' for Foreign
+Branch of companies.
+
+More information:
+
+* https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Brunei-darussalam-TIN%20.pdf
+
+>>> validate('RC00004866')
+'RC00004866'
+>>> validate('RFC/00000772')
+'RFC00000772'
+>>> validate('12345')
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> format('RFC/00000772')
+'RFC00000772'
+"""  # noqa: E501
+
+from stdnum.exceptions import *
+from stdnum.util import clean, isdigits
+
+
+def compact(number):
+    """Convert the number to the minimal representation.
+
+    This strips the number of any valid separators and removes surrounding
+    whitespace.
+    """
+    return clean(number, ' -/').upper().strip()
+
+
+def validate(number):
+    """Check if the number is a valid Brunei ROCBN number.
+
+    This checks the length and formatting.
+    """
+    number = compact(number)
+    if len(number) not in (9, 10, 11):
+        raise InvalidLength()
+    if not isdigits(number[-8:]):
+        raise InvalidFormat()
+    if len(number) == 9 and not number.startswith('P'):
+        raise InvalidFormat()
+    if len(number) == 10 and not number.startswith('RC'):
+        raise InvalidFormat()
+    if len(number) == 11 and not number.startswith('RFC'):
+        raise InvalidFormat()
+    return number
+
+
+def is_valid(number):
+    """Check if the number is a valid Brunei ROCBN number."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the number to the standard presentation format."""
+    return compact(number)

tests/test_bn_rocbn.doctest

@@ -0,0 +1,91 @@
+test_bn_rocbn.doctest - more detailed doctests for stdnum.bn.rocbn module
+
+Copyright (C) 2023 Leandro Regueiro
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA
+
+
+This file contains more detailed doctests for the stdnum.bn.rocbn module. It
+tries to test more corner cases and detailed functionality that is not really
+useful as module documentation.
+
+>>> from stdnum.bn import rocbn
+
+
+Tests for some corner cases.
+
+>>> rocbn.validate('P00084071')
+'P00084071'
+>>> rocbn.validate('RC00004866')
+'RC00004866'
+>>> rocbn.validate('RC/6953/2007')
+'RC69532007'
+>>> rocbn.validate('RFC/00000772')
+'RFC00000772'
+>>> rocbn.validate('12345')
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> rocbn.validate('P1234567X')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.validate('RC1234567X')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.validate('RFC1234567X')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.validate('V12345678')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.validate('VV12345678')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.validate('VVV12345678')
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> rocbn.format('P00084071')
+'P00084071'
+>>> rocbn.format('RC/6953/2007')
+'RC69532007'
+>>> rocbn.format('RFC/00000772')
+'RFC00000772'
+
+
+These have been found online and should all be valid numbers.
+
+>>> numbers = '''
+...
+... P20008207
+... P00084071
+... P20006927
+... RC/6953/2007
+... RC/00006326
+... RC/00009742
+... RC00004866
+... RC00006420
+... RFC00000061
+... RFC/00000772
+...
+... '''
+>>> [x for x in numbers.splitlines() if x and not rocbn.is_valid(x)]
+[]